【新文速递】2024年11月14日复合材料SCI期刊最新文章

今日更新：Composites Part A: Applied Science and Manufacturing 2 篇，Composites Science and Technology 4 篇Composites Part A: Applied Science and ManufacturingNear pixel-level characterisation of microfibres in 3D-printed cementitious composites and migration mechanisms using a novel iterative methodRijiao Yang, Chengji Xu, Yan Lan, Yue Qiu, Zhendi Wang, Yu Peng, Qiang Zengdoi:10.1016/j.compositesa.2024.108404近像素级表征微纤维在3d打印胶凝复合材料和迁移机制使用一种新的迭代方法Microfibre reinforcement is widely used for additively manufactured composites, however, it remains a challenging task to resolve the 3D distribution of microfibres in the matrix with low contrast and resolution for imaging analysis. To address this challenge, we propose a novel iterative destruction–filtering–repairing (DFR) image processing method, and take glass microfibre-embedded extrusion-moulded cementitious filaments (EMCFs) as an example for 3D structural analysis with X-ray computed tomography. Results show that the DFR method enables near pixel-level microfibre diagnosis with high accuracy beyond the ordinary image processing method. The glass microfibres are unevenly distributed in the EMCFs and their orientations are different between the filament body and the interfacial zone, uncovering the mechanisms of extrusion-affected material migration, collision, and redistribution. Our findings make a breakthrough in imaging analysis with limited resolution and contrast, providing a broad path towards better understanding microstructure of 3D printed fibre-reinforcement composites.微纤维增强材料广泛应用于增材制造复合材料，然而，在低对比度和分辨率的情况下，解决微纤维在基体中的三维分布问题仍然是一项具有挑战性的任务。为了解决这一挑战，我们提出了一种新的迭代破坏-滤波-修复(DFR)图像处理方法，并以玻璃微纤维嵌入挤压成型胶凝细丝(EMCFs)为例，使用x射线计算机断层扫描进行三维结构分析。结果表明，DFR方法能够实现近像素级的微纤维诊断，比普通图像处理方法具有更高的诊断精度。玻璃微纤维在EMCFs中的分布不均匀，其取向在丝体和界面区之间存在差异，揭示了挤压影响材料迁移、碰撞和再分布的机制。我们的发现在有限分辨率和对比度的成像分析方面取得了突破，为更好地理解3D打印纤维增强复合材料的微观结构提供了广阔的途径。A novel strategy to break through the strength-ductility trade-off of titanium matrix compositesQiang Wang, Zhao-Hui Zhang, Luo-Jin Liu, Xiao-Tong Jia, Yang-Yu He, Jin-Zhao Zhou, Yuan-Hao Sun, Xing-Wang Chengdoi:10.1016/j.compositesa.2024.108407突破钛基复合材料强度-延性权衡的新策略This study used a solution blending method to coat Ti64 alloy particles with an organopolysilazane (OPSZ) precursor, creating (TiC + Ti3Si)/Ti64 composites via spark plasma sintering (SPS). During SPS, OPSZ decomposes, releasing silicon, carbon, and nitrogen. Nitrogen exits as NH3 and N2, while carbon and silicon partially dissolve in the matrix and partially react with titanium to form TiC and Ti3Si particles. The composite with 0.5 wt% OPSZ exhibited a tensile strength of 1135 MPa and an elongation of 19.0 %, 18.2 % and 28.5 % higher than commercial Ti64 alloy, respectively. The strength increase is attributed to grain refinement, solid solution strengthening, Orowan strengthening, and L phase strengthening. The improved ductility results from fine precipitates promoting dislocation multiplication, the dislocation storage effect of the interface L-phase, and matrix purification by H2 and NH3 from OPSZ decomposition.本研究采用溶液共混的方法，用有机聚硅氮烷(OPSZ)前驱体包覆Ti64合金颗粒，通过火花等离子烧结(SPS)制备(TiC + Ti3Si)/Ti64复合材料。在SPS过程中，OPSZ分解，释放出硅、碳和氮。氮以NH3和N2的形式存在，碳和硅部分溶解于基体中，与钛部分反应形成TiC和Ti3Si颗粒。添加0.5 wt% OPSZ的复合材料的抗拉强度为1135 MPa，伸长率分别比工业Ti64合金高19.0 %、18.2 %和28.5 %。强度的提高主要是由于晶粒细化、固溶强化、Orowan强化和L相强化。微相促进位错增殖、界面l相的位错储存作用以及OPSZ分解产生的H2和NH3对基体的净化作用是提高塑性的主要原因。Composites Science and TechnologyEffects of welding displacement and energy director thickness on the ultrasonic welding of epoxy-to-polyetherimide based hybrid composite jointsJiaming Liu, Dongsheng Yue, Xuemin Wang, Jiaying Pan, Dongmin Yang, Dong Quan, Guoqun Zhaodoi:10.1016/j.compscitech.2024.110810 焊接位移和导能器厚度对环氧-聚醚酰亚胺基复合材料接头超声焊接的影响This study aimed to develop robust thermoplastic-to-thermoset composite joints upon an ultrasonic welding process. The carbon fiber/epoxy composite was topped with a layer of polyetherimide (PEI) film by a co-curing process, making it “weldable” with the carbon fiber/PEI composite. The effects of welding displacement and thickness of the energy director (ED) on the welding process of the epoxy-to-PEI hybrid composite joints were investigated. The experimental results demonstrated that an optimal welding displacement existed for the best welding quality, whose value depended on the ED thickness. Given a certain ED thickness, the lap-shear strength (LSS) of the hybrid joints increased to a maximum value and then decreased as the welding displacement increased. By optimizing the displacement and ED thickness, a maximum LSS of 39.4 MPa was obtained for the hybrid joints. In which case, the level of the defects within the welding line was minimized, and the joints failed cohesively within the composite substrates.本研究旨在利用超声波焊接工艺开发坚固的热塑性-热固性复合材料接头。通过共固化工艺，在碳纤维/环氧复合材料表面覆盖一层聚醚酰亚胺(PEI)薄膜，使其与碳纤维/PEI复合材料“可焊接”。研究了焊接位移和导能器厚度对环氧- pei复合材料接头焊接过程的影响。实验结果表明，为了获得最佳焊接质量，存在一个最优焊接位移，其大小与ED厚度有关。在一定ED厚度下，随着焊接位移的增大，混合接头的搭接抗剪强度先增大后减小。通过对位移和ED厚度的优化，得到了混合接头最大LSS为39.4 MPa。在这种情况下，焊接线内的缺陷水平被最小化，接头在复合基板内粘结失效。Strongly reinforced mechanical and thermal properties of polyamide 66 by high loading titanium dioxide whiskersYankun Gong, Juan Chen, Jiacheng Zhang, Yanfen Ding, Peng Liu, Haijun Fan, Mingshu Yangdoi:10.1016/j.compscitech.2024.110811 高负荷二氧化钛晶须增强聚酰胺66的机械和热性能Of large length-to-diameter ratio and specific area, inorganic whiskers were widely applied for polymer reinforcement. As a well-known nanofiller, titanium dioxide (TiO2) has been welcome by polymer engineering, mostly for whitening with spherical shapes favored. To date, there have been no TiO2 whiskers reported for polymer reinforcement. In this work, a rutile type TiO2 whisker was compounded with polyamide 66 (PA66) to prepare nanocomposites with surficial modification being conducted to further improve the compatibility between them. It was found that the rutile-type TiO2 whisker significantly improves the mechanical properties of PA66 at high loadings and the performance went better when surficial modification for it was applied. Under 50 wt% addition of TiO2 whisker either modified or not, the tensile strength, tensile modulus, flexural strength, flexural modulus, impact strength and heat deformation temperature of prepared PA66 composites were respectively increased by 52%, 279%, 44%, 313%, 20%, 199% and 84%, 279%, 88%, 303%, 114%, 207%, comparing with the pristine PA66. The mechanism regarding the overall reinforcement was analyzed, which was attributed to the shape-relevant multiple interactions between TiO2 and PA66. Besides, the improved adhesion due to strong stable chemical bonding by surficial modification of fillers, is also accountable.无机晶须具有较大的长径比和比表面积，在聚合物增强中得到了广泛的应用。二氧化钛(TiO2)作为一种众所周知的纳米填料，一直受到聚合物工程的欢迎，主要用于增白，其球形结构受到青睐。到目前为止，还没有TiO2晶须用于聚合物增强的报道。本文将金红石型TiO2晶须与聚酰胺66 (PA66)复合制备纳米复合材料，并对其进行表面改性，进一步提高两者之间的相容性。结果表明，金红石型TiO2晶须在高负载下显著提高了PA66的力学性能，并对其进行表面改性后性能得到改善。当TiO2晶须添加量为50wt %时，制备的PA66复合材料的拉伸强度、拉伸模量、弯曲强度、弯曲模量、冲击强度和热变形温度分别比原始PA66提高了52%、279%、44%、313%、20%、199%和84%、279%、88%、303%、114%、207%。分析了整体增强的机理，认为这是TiO2与PA66之间形状相关的多重相互作用所致。此外，由于填料的表面改性产生了强而稳定的化学键，从而提高了附着力。Green Crosslinking Strategy for Ethylene-Vinyl Acetate Rubber Composites with NH2-POSS as a Crosslinking Agent and Reinforcing NanofillerJunjie Peng, Guojie Zhang, Yourong Duan, Hanbing Wang, Yong Zhangdoi:10.1016/j.compscitech.2024.110808 以NH2-POSS为交联剂和增强纳米填料的乙烯-醋酸乙烯橡胶复合材料绿色交联策略Ethylene-vinyl acetate rubber is extensively utilized in various fields including electrical wires and cables, automotive, and electronic components. Traditional peroxide vulcanization methods, however, release volatile organic compounds, posing environmental pollution concerns. To address this, 3-amino-polyhedral oligomeric silsesquioxane (NH2-POSS) was synthesized through hydrolytic condensation and used both as a crosslinking agent and a filler in the preparation of ethylene-vinyl acetate-glycidyl methacrylate terpolymer (EVM-GMA) composites. Notably, NH2-POSS not only effectively crosslinks EVM-GMA, but also thus promotes the dispersion of the silica in the composites. EVM-GMA/silica composites crosslinked by NH2-POSS display superior mechanical properties and thermal stability compared to EVM-GMA/silica composites crosslinked by organic peroxide. EVM-GMA composite with 4.5 phr NH2-POSS and 30 phr SiO2 has a tensile strength of 10.7 MPa and an elongation at the break of 240%. This study introduces a novel and environmentally friendly crosslinking strategy for producing high-performance EVM-GMA composites without additional additives.乙烯-醋酸乙烯橡胶广泛应用于电线电缆、汽车、电子元器件等领域。然而，传统的过氧化物硫化方法 会释放出挥发性有机化合物，造成环境污染问题。为了解决这一问题，采用水解缩合的方法合成了3-氨基多面体低聚硅氧烷(NH2-POSS)，并将其作为交联剂和填料用于制备乙烯-醋酸乙烯-甲基丙烯酸缩水甘油酯三元共聚物(EVM-GMA)复合材料。值得注意的是，NH2-POSS不仅有效地交联了EVM-GMA，而且促进了二氧化硅在复合材料中的分散。与有机过氧化物交联的EVM-GMA/silica复合材料相比，NH2-POSS交联的EVM-GMA/silica复合材料具有更好的力学性能和热稳定性。含有4.5 phr NH2-POSS和30 phr SiO2的EVM-GMA复合材料的抗拉强度为10.7 MPa，断裂伸长率为240%。本研究介绍了一种新的环保交联策略，用于生产高性能EVM-GMA复合材料，无需额外的添加剂。Enhancing Electromagnetic Shielding Property and Absorption Coefficients via Constructing Electromagnetic Rings in Janus CompositesXin Hou, Xue-Rong Feng, Ke Jiang, Yu-Chen Zheng, Jiang-Tao Liu, Ming Wangdoi:10.1016/j.compscitech.2024.110809 通过构造电磁环提高Janus复合材料的电磁屏蔽性能和吸收系数Polymer based electromagnetic wave (EMW) shielding materials with high conductivity have excellent electromagnetic shielding properties, but also exhibit high reflection of EMWs, resulting in inevitable secondary electromagnetic pollution. EMW shielding materials with low reflection have extensive potential applications in the next generation of anti-EMW equipment. Herein, a production strategy combining three dimensional (3D) printing technology and solution casting method was proposed to prepare polylactic acid (PLA)@multi-walled carbon nanotubes (MWCNT)/polydimethylsiloxane (PDMS)@carbonyl iron powder (CIP) absorptive electromagnetic shielding Janus composites with a ring-shaped electromagnetic synergistic structure (spiral rings or concentric circular rings). By utilizing PLA and MWCNTs as primary components, a 3D integrated framework that combines a highly conductive reflector and a ring inductance structure can achieve significant EMW shielding performance with low reflection. With PDMS as a matrix and magnetic CIP as functional fillers, a strong magnetic permeability network is provided around the ring inductance frame. The magnetic loss resulting from electromagnetic cooperative ring structure further enhances microwave absorption capacity. The composite materials, benefiting from the synergistic interaction between the electromagnetic rings and the reflector, demonstrate excellent impedance matching and efficient EMW shielding capabilities. Specifically, the PLA@MWCNT/PDMS@CIP Janus composites with ring structure exhibit a notable EMW shielding effectiveness (SE) of 31 dB and a reflection coefficient as minimal as 0.3. Therefore, this study presents a powerful approach to the development of low-reflective materials with high EMW SE, promising potential applications in the next-generation intelligent electronic devices.聚合物基高导电性电磁波屏蔽材料具有优异的电磁屏蔽性能，但对电磁波的反射也较高，不可避免地造成二次电磁污染。低反射的电磁屏蔽材料在新一代抗电磁设备中具有广泛的应用前景。本文提出了三维打印技术与溶液铸造技术相结合的生产策略，制备了具有环形电磁协同结构(螺旋环或同心圆环)的聚乳酸(PLA)@多壁碳纳米管(MWCNT)/聚二甲基硅氧烷(PDMS)@羰基铁粉(CIP)吸收电磁屏蔽Janus复合材料。利用PLA和MWCNTs作为主要元件，结合高导电性反射器和环形电感结构的三维集成框架可以实现低反射、显著的EMW屏蔽性能。以PDMS为基体，磁性CIP为功能填料，在环形电感框架周围形成强磁导率网络。电磁协同环结构产生的磁损失进一步提高了微波吸收能力。该复合材料得益于电磁环与反射器之间的协同作用，具有良好的阻抗匹配和高效的EMW屏蔽能力。其中，环状结构的PLA@MWCNT/PDMS@CIP Janus复合材料的EMW屏蔽效果(SE)为31 dB，反射系数低至0.3。因此，该研究为开发具有高EMW SE的低反射材料提供了一种强有力的方法，在下一代智能电子设备中具有潜在的应用前景。来源：复合材料力学仿真Composites FEM